streams/Zotlabs/Widget/Chatroom_members.php

<?php

namespace Zotlabs\Widget;

class Chatroom_members
{

    // The actual contents are filled in via AJAX

    public function widget()
    {
        return replace_macros(get_markup_template('chatroom_members.tpl'), array(
            '$header' => t('Chat Members')
        ));
    }
}